JP2007333107A - Connecting fitting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connecting fitting which transmits high pressure, vacuum and a gas, and inhibits an outgas by using a metal seal as well as a rubber seal material such as an O-ring. <P>SOLUTION: The connecting fitting comprises: a plurality of fitting projecting portions 21 respectively disposed on a pair of connecting fitting main bodies 11, 12, arranged in the circumferential direction of the connecting fitting main bodies 11, 12 and projecting in the axial direction; and fitting recessed portions 22 formed between the fitting projecting portions 21. The fitting projecting portions 21 and the fitting recessed portions 22 of the pair of connecting fitting main bodies 11, 12 are respectively axially fitted to the fitting recessed portions 22 and the fitting projecting portions 21 of the other-side connecting fitting main bodies 11, 12, and the fitting projecting portions 21 are provided with locking hook portions 23 circumferentially locked in the fitting recessed portions 22 of the other-side connecting fitting main bodies 11, 12 to control axial movement, and locking the pair of connecting fitting main bodies 11, 12 in the axial direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to, for example, a coupling fitting used for connection between fire hoses, connection between fire hoses and equipment, connection of refrigerant pipes, gas pipes, oil pipes, and the like.

  The applicant has developed and registered a joint fitting consisting of a pair of joint bodies with the same structure and no distinction between males and females that connect fire hoses and other hoses to each other or liquid transport piping. (For example, refer to Patent Document 1).

  As shown in FIG. 7, the coupling fitting is provided on each of the pair of coupling fitting main bodies 1 and 2, and is arranged in the circumferential direction of the coupling fitting main bodies 1 and 2, and has a plurality of fitting protrusions protruding in the axial direction. 3 and a fitting recess 4 formed between these fitting projections 3. The fitting convex part 3 and the fitting concave part 4 of the pair of coupling metal bodies 1 and 2 are axially fitted to the fitting concave part 4 and the fitting convex part 3 of the mating coupling metal bodies 1 and 2 on the other side. The fitting projection 3 is locked in the circumferential direction with the fitting projection 3 of the mating fitting main bodies 1 and 2 on the other side to restrict axial movement, and the pair of fitting fitting bodies are locked in the axial direction. A locking collar portion 5 is formed.

Cylindrical bodies 6 and 7 are provided inside the pair of coupling metal bodies 1 and 2, and sealing materials 8 such as rubber packings are attached to the end faces of the cylindrical bodies 6 and 7 facing each other. When the pair of coupling metal bodies 1 and 2 are coupled in the axial direction, the sealing material 8 abuts each other so that the pair of coupling metal bodies 1 and 2 are fluid-tightly coupled.
Japanese Patent No. 3107507

However, the coupling fitting for connecting the hoses such as the fire hose shown in Patent Document 1 using a pair of coupling fitting bodies having the same structure without distinction between males and females is to seal by pressing sealing materials such as rubber packings. There is no choice but to use rubber lip seal type packing that can ensure a large amount of deflection. That is, a metal seal with a small amount of deflection cannot be used. As a result, it cannot be used at high pressures where the working pressure exceeds 3 MPa. In addition, there is a problem that gas permeation and outgassing cannot be suppressed.
The present invention has been made paying attention to the above circumstances, and its object is to suppress high-pressure, vacuum and gas permeation and outgas by using a metal seal as well as a rubber seal material such as an O-ring. It is intended to provide a fitting that can be used.

  In order to achieve the above-mentioned object, the present invention provides a pair of cylindrical coupling metal bodies as a coupling metal for coupling hoses to each other or to each other or to each other in a fluid flow state. An inner seal portion provided on one outer peripheral surface of the coupling metal body, a sealing material fitted to the inner seal portion, and provided on the other inner circumferential surface of the coupling metal body, the sealing material A plurality of outer seal portions that are abutted with the radial direction of the first and second metal fittings, and are provided on the pair of coupling metal bodies so as to surround the outer seal parts, and are arranged in the circumferential direction of the coupling metal bodies and project in the axial direction. A fitting convex portion and a fitting concave portion formed between the fitting convex portions, and the fitting convex portion and the fitting concave portion of the pair of coupling metal bodies are fitted into the mating coupling metal body on the other side. It fits in the axial direction to the recess and the fitting protrusion, this The fitting convex portion has a locking collar portion for locking the pair of coupling fitting bodies in the axial direction by locking the fitting fitting main body in the circumferential direction by locking the fitting concave portion of the mating coupling fitting body in the circumferential direction. It is formed.

  A second aspect of the present invention is characterized in that the inner seal portion and the outer seal portion of the first aspect are fitting portions that are alternately fitted with the seal material interposed therebetween.

  A third aspect of the present invention is characterized in that the sealing material of the first aspect is a metal seal in which a coil spring is housed inside a C-shaped jacket.

  According to a fourth aspect of the present invention, the seal material of the first aspect is a metal seal in which a rubber D-ring is housed inside a C-shaped jacket.

According to a fifth aspect of the present invention, in the first aspect of the present invention, the fitting convex portions of the pair of coupling metal bodies are further provided with a biasing mechanism that biases the locking hook portions in a direction in which the locking hook portions are locked with each other. And
According to a sixth aspect of the present invention, the plurality of fitting protrusions according to the first aspect and a fitting concave portion formed between the fitting protrusions are provided in an annular coupling member, and the annular coupling member is formed on the coupling metal body. It is a separate member and is fitted to the coupling metal body.

According to the present invention, even when a rubber sealing material such as an O-ring is used, it can be used at a high pressure up to about 25 MPa. Furthermore, by using a metal seal, it can be used at a high pressure of up to about 80 MPa, can be used in a vacuum of up to about 1.33 × 10 ⁻⁸ Pa, and further has an effect of allowing gas permeation and suppression of outgassing. .

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a first embodiment of a coupling fitting, which includes a cylindrical first coupling fitting main body 11 and a second coupling fitting main body 12. These first and second coupling metal bodies 11 and 12 are used as joints connecting fire hoses or pipes or joints connecting hoses and pipes or other devices, and fluid flow passages 11a and 12a are provided inside. Forming.

A flange portion 13 is provided at a connection end portion of the first coupling metal body 11, and an inner seal portion 15 having an annular recess 14 on the outer peripheral surface is formed on the end portion side of the flange portion 13. An outer seal portion 16 that is fitted to the outside of the inner seal portion 15 and has an end surface close to the flange portion 13 is formed at the connection end portion of the second coupling metal body 12. Therefore, the inner seal portion 15 and the outer seal portion 16 are fitted. An O-ring 17 as a rubber seal material is fitted into the annular recess 14, and the O-ring 17 is sealed on the inner side by the inner seal portion 15, and the outer side, that is, the radial direction abuts on the outer seal portion 16. And fluid tightly sealed.

In addition, a pair of annular coupling members 18 are provided on the outside of the seal portion formed by the inner seal portion 15 and the outer seal portion 16 of the first and second coupling metal bodies 11 and 12. These annular coupling members 18 have the same structure, and an annular convex portion 19 projecting inward is provided at the base end portion. The annular convex portion 19 of one annular coupling member 18 abuts against the flange portion 13 and is prevented from coming off, and the other annular convex portion 19 abuts against the step portion of the outer seal portion 16 and is prevented from coming off.

  The coupling structure of the pair of annular coupling members 18 is basically the same as that of a coupling fitting known from Japanese Patent No. 3107507, and includes a cylindrical body 20 at the front end of the annular coupling member 18. The tube main body 20 has a substantially cylindrical shape, and a plurality of fitting convex portions 21 are integrally projected at the front end portion of the tube main body 20. These fitting convex portions 21 are arranged at equal intervals in the circumferential direction of the tube main body 20.

  Further, a space between these fitting convex portions 21 is formed as a fitting concave portion 22, and a stepped hook-like locking hook portion 23 is formed on one side surface 21 a of the fitting convex portion 21. . The tip corners of the other side surface 21b of these fitting convex portions 21 are formed in an arc shape to form a guide portion 24.

  Further, an urging mechanism 25 is provided on each of the other side surfaces 21b of the fitting convex portions 21. These urging mechanisms 25 are composed of a steel ball and a spring that urges the steel ball in the protruding direction, and these urging mechanisms 25 are embedded in the other side surface 21 b of these fitting convex portions 21. It is. Therefore, when these fitting convex portions 21 are fitted into the mating fitting concave portions 22, the steel balls come into contact with each other and are pressed against each other, and the other side surface 21 b of these fitting convex portions 21 is moved. Energize away from each other. As a result, the one side surface 21a of the fitting convex portion 21 is urged so as to be close to each other, and the locking collar portion 23 of the one side surface 21a is urged to engage with each other. ing.

  When the coupling portions of the pair of annular coupling members 18 are abutted in the axial direction, for example, the fitting convex portion 21 of one annular coupling member 18 is in the fitting concave portion 22 of the other annular coupling member 18. And the fitting convex portion 21 of the other annular coupling member 18 is fitted into the fitting concave portion 22 of the one annular coupling member 18 so as to be complementarily fitted to each other. Similarly, the fitting convex portion 21 of one annular coupling member 18 is fitted in the fitting concave portion 22 of the other annular coupling member 18, and the fitting convex portion 21 of the other annular coupling member 18 is fitted into one annular shape. The coupling member 18 is fitted in the fitting recess 22 and is fitted in a complementary manner.

  According to the first embodiment, the O-ring 17 is used as the sealing material, but the inner seal portion 15 and the outer seal portion 16 are fitted, and the inner side of the O-ring 17 is sealed by the inner seal portion 15. The outer side abuts on the outer seal part 16 and is fluid-tightly sealed. Therefore, even if the pressure of the fluid flowing through the fluid flow passages 11a and 12a is high (about 25 MPa), it can sufficiently withstand.

2 and 3 show the second embodiment, and the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted. As shown in FIG. 2, a flange portion 13 is provided at the connection end portion of the first coupling metal body 11, and the outer peripheral surface is narrowed from the end surface toward the flange portion 13 toward the end portion side of the flange portion 13. An inner seal portion 27 having an annular cutout portion 26 formed in the diameter is formed. An outer seal portion 28 is formed at the connection end portion of the second coupling fitting main body 12 so as to be fitted to the outside of the annular notch portion 26 and the inner seal portion 27 and the end face thereof is close to the flange portion 13. Therefore, the inner seal portion 27 and the outer seal portion 28 are fitted. A metal seal 29 as a sealing material is fitted into the annular notch 26. The metal seal 29 is a Sun Leyme II (registered trademark) manufactured by Mitsubishi Electric Wire Industries, Ltd., and as shown in FIG. 3, the inside of the C-shaped jacket 30 made of an aluminum jacket having a C-shaped cross section that opens in the outer peripheral direction. A rubber D-ring 31 is housed inside, and the inner side is sealed by the inner seal portion 27, and the outer side, that is, the radial direction, abuts on the outer seal portion 28 and is fluid-tightly sealed. This Sun Remez II (registered trademark) has a high sealing performance (× 10 ⁻¹¹ Pa · m ³ / sec.) Comparable to that of a metal seal. Further, the tightening force is close to that of a rubber seal and is characterized by being smaller than that of a metal seal.
According to the second embodiment, even if the pressure of the fluid flowing through the fluid flow passages 11a and 12a is high (about 80 MPa), it can sufficiently withstand, and up to about 1.33 × 10 ⁻⁸ Pa. It can be used even in a vacuum, and further has an effect that gas permeation and outgassing can be suppressed.
FIG. 4 shows a third embodiment, and the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted. The present embodiment is a metal seal 32 that is fitted as a seal material to the annular cutout 26 provided at the connection end of the first coupling metal body 11 shown in the second embodiment, and in the outer circumferential direction. The coil spring 34 is housed inside a C-shaped jacket 33 having a C-shaped open section, the inside is sealed by the inner seal portion 27, and the outside, that is, the radial direction collides with the outer seal portion 28. It is fluid tightly sealed. The metal seal 32 is a Sun Cup (registered trademark) manufactured by Mitsubishi Electric Cable Industries, and a coil spring 34 made of nickel is housed inside a C-type jacket 33 made of SUS316L.

According to the third embodiment, even if the pressure of the fluid flowing through the fluid flow passages 11a and 12a is high (about 80 MPa), it can sufficiently withstand, and up to about 1.33 × 10 ⁻⁸ Pa. It can be used even in a vacuum, and further has an effect that gas permeation and outgassing can be suppressed.
5 and 6 show a fourth embodiment, FIG. 5 is a front view of the coupling fitting, and FIG. 6 is a sectional view showing a pair of coupling fittings taken along the line ABC in FIG. The Storz coupling metal fitting 35 fitted to the first and second coupling metal fitting bodies 11 and 12 of the first embodiment is shown.

  As shown in FIGS. 5 and 6, the Storz coupling metal fitting 35 is composed of a pair of annular coupling members 36 a and 36 b having the same structure, and each of the annular coupling members 36 a and 36 b includes a cylinder body 37. These cylindrical main bodies 37 have a cylindrical shape, and, for example, two fitting convex portions 38 are provided so as to protrude in the axial direction at point-symmetric positions around the axis O at the front end portion. The fitting protrusions 38 are provided with substantially L-shaped locking collars 38 a that protrude in the outer peripheral direction of the tube main body 37.

  A fitting recess 39 that is wider and deeper than the fitting projection 38 is provided on the right side of the fitting projection 38 so that the fitting projection 38 is fitted. An engagement receiving portion 40 is provided in the circumferential direction of the cylinder main body 37 further to the right of the fitting recess 39. The engagement receiving part 40 protrudes along the longitudinal direction of the concave groove 41 so as to narrow the opening width of the concave groove 41, and the locking collar part 38a, The engaging edge 41a is engaged.

The engaging edge 41a is provided with an inclined surface 42 and a stopper 43 so that the axial thickness of the cylinder body 37 gradually increases from the fitting recess 39 in the clockwise direction. Then, when the fitting convex portion 38 of one annular coupling member 36a is fitted into the fitting concave portion 39 of the other annular coupling member 36b and the annular coupling members 36a and 36b are rotated relatively clockwise, When the collar portion 38a is engaged with the engagement edge portion 41a and the locking collar portion 38a approaches the upward slope of the inclined surface 42, the annular coupling members 36a and 36b are pulled toward each other in the axial direction and the front end surfaces are joined to each other. It is supposed to be.
Therefore, when the annular coupling members 36a and 36b are fitted to the first and second coupling metal bodies 11 and 12 of the first embodiment and the inner seal portion 15 and the outer seal portion 16 are fitted, the inner seal portion The space between the outer seal portion 15 and the outer seal portion 16 is sealed with a sealing material, and the same effect as in the first embodiment is obtained.
The coupling fitting of the present invention can be applied in a wide range such as connection of fire hose, connection of refrigerant pipe and hose of air conditioner, supply pipe for hydrogen and gasoline, pipe for aerospace equipment and high pressure hose.
The present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Moreover, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, the constituent elements over different embodiments may be combined.

The side view which showed the 1st Embodiment of this invention and cut | disconnected a part of coupling fitting. The side view which showed the 2nd Embodiment of this invention and cut | disconnected a part of coupling fitting. Sectional drawing of a metal seal | sticker which shows the same embodiment. Sectional drawing of a metal seal which shows the 3rd Embodiment of this invention. The 4th Embodiment of this invention is shown, The front view of an annular coupling member, Sectional drawing which shows the same embodiment and shows a pair of cyclic | annular coupling member which followed the ABC line of FIG. The side view which carried out the cross section of a part of conventional coupling metal fittings.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11, 12 ... Joint metal fitting body, 15 ... Inner seal part, 16 ... Outer seal part, 17 ... O-ring (sealing material) 21, 38 ... Fitting convex part, 22, 39 ... Fitting concave part, 23, 38a ... Locking collar

Claims (6)

In a coupling fitting that couples hoses or pipes or hoses and pipes or other equipment in a fluid flow state,
A pair of cylindrical fitting metal bodies, an inner seal portion provided on one outer peripheral surface of the fitting metal bodies, a sealing material fitted to the inner seal portion, and the other inner circumference of the coupling metal body An outer seal portion which is provided on the surface and abuts against the radial direction of the seal material, and is provided on each of the pair of coupling metal bodies so as to surround the outer seal portion, and is arranged in a circumferential direction of the coupling metal body. A plurality of fitting projections projecting in the axial direction, and fitting recesses formed between the fitting projections, and the fitting projections and fitting recesses of the pair of coupling metal bodies are opposed to each other Fitting recesses and fitting projections on the side fitting metal body are fitted in the axial direction, and these fitting projections are circumferentially locked on the fitting depressions on the mating fitting metal body on the other side and are axially engaged. A locking collar portion that restricts the movement and locks the pair of coupling metal bodies in the axial direction is formed. Fitting that characterized the door.   2. The coupling fitting according to claim 1, wherein the inner seal portion and the outer seal portion are fitting portions that are alternately fitted with the seal material interposed therebetween.   The coupling metal fitting according to claim 1, wherein the sealing material is a metal seal in which a coil spring is housed in a C-shaped jacket.   The coupling metal fitting according to claim 1, wherein the seal material is a metal seal in which a rubber D-ring is accommodated in a C-shaped jacket.   2. The coupling fitting according to claim 1, further comprising an urging mechanism that urges the fitting projections of the pair of coupling fitting main bodies in a direction in which the locking hooks are engaged with each other.   The plurality of fitting projections and a fitting recess formed between the fitting projections are provided in an annular coupling member, and the annular coupling member is a separate member from the coupling fitting body, and the coupling The coupling metal fitting according to claim 1, wherein the fitting metal fitting is fitted to the metal fitting main body.

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